Maxima Function
max (x_1, ..., x_n)
Return a simplified value for the maximum of the expressions x_1 through x_n.
When get (trylevel, maxmin), is 2 or greater, max uses the simplification
max (e, -e) --> |e|. When get (trylevel, maxmin) is 3 or greater, max tries
to eliminate expressions that are between two other arguments; for example,
max (x, 2*x, 3*x) --> max (x, 3*x). To set the value of trylevel to 2, use
put (trylevel, 2, maxmin).